Clear bra or invisbra, would probably be your best bet, If you dont want to do it yourself I am sure that a detail shop in your area could do it for you at a resonable price..... I do not have any expirence with doing the inside of the X, but a good friend of mine who is also an installer swears by the stuff, he puts it on the gas tanks of alot of motorcycles to prevent scratches from belt buckles and stuff, not to mention on the front of all types of vehicles... and if you get a quality product that is fitted properly you would not even be able to tell that it is on there... ie, no yellowing or peeling... and if and when it does start to get beat up you can peel it off and replace it....FWIW